Google slipped in as a member of the Streaming Video Alliance ahead of Netflix at the end of last week, a significant move as Google represents the first pure play OTT video service provider to sign up – another signal from the search engine giant that promoting an open TV ecosystem is high on its agenda. Amazon’s cloud technology arm AWS joining the Alliance back in November was a huge boost for promoting technical collaboration in OTT video, but the owner of the world’s largest video sharing site in YouTube is arguably the biggest signature to date. Major members such as Comcast, Verizon, Sky and Liberty Global all offer streaming services of sorts to complement their traditional businesses, but YouTube…